A comprehensive school is a public school for elementary aged or secondary aged children that does not select its intake on the basis of academic achievement or aptitude, in contrast to the selective school system where admission is restricted on the basis of selection criteria. The term is commonly used in relation to England and Wales, where comprehensive schools were introduced as state schools on an experimental basis in the 1940s and became more widespread from 1965. With the Blair educational reforms from 2003, they may be part of a local education authority or be a self governing academy or part of a multi-academy trust.